London: Royal Society of London, 1868. Three Quarter Leather. First Edition. iv, , iv, , 26, 672, , 32 [plates] pp. 4to. Recent brown three quarter leather bindings with five raised bands at spine, burgundy title patch with gold embossed titling, gold lines offsetting bands, decorative stamp in each compartment without titling, blind embossed borders to front and rear boards. Interiors clean, ex-library stamp on verso of title page, and occurring sporadically within. Pages were trimmed slightly when rebound. Very Good.
One of James Clerk Maxwell's (1831-1879) most important papers outlining his theory of a new derivation of the distribution law of gas velocities tied directly to molecular collisions. It corrected and extended his 1860 paper and greatly strengthened the theory that gases (and, by extension, all forms of matter) are composed of molecules. The paper also introduced the concept of relaxation time to explain the diffusion of stress in fluids, providing a theoretical grounding for the kinetic theory of gases, explaining why the viscosity of a gas is independent of its density -- an unexpected result.